blazer 97 don't start

Hi,
my blazer 1997 don't wan't to start.
All the fuse looks good.
All the motor turn but he don't smell gaz.
I put some gaz on the injection and he want to start but he seem that the gaz don't come to the motor.
I never have problem like this.Do you have some hint
thanks

Put a new fuel filter on lately? Check fuel pressure, should be 60-66psi key on, engine off and pressure should hold when pump shuts off. Do you hear the fuel pump turn on when you turn the key to "on"?

I ear a little noise but i'm not sure.
I came with my truck in the morning to my job normally but when i wan't to go home he never wan't to start.